The first aircraft crash I responded to was a Lockheed Jetstar that aborted its takeoff from 09L at MIA. The first officer was able to exit the cockpit window, but the captain perished in the post crash fire. The initial fire was extinguished, but fire continued to erupt for several hours after the crash until the battery was finally disconnected. Depending on the aircraft, the battery voltage is somewhere around 28 V DC, so I can imagine the problems that may be associated with the crash of an electrically-powered aircraft featuring voltages of around 400-800 V DC (or more).